scholarly journals Hyperradiance by a stream of phase-correlated atomic dipole pairs traversing a high-Q cavity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Junseok Han ◽  
Jinuk Kim ◽  
Seung-hoon Oh ◽  
Gibeom Son ◽  
Junseo Ha ◽  
...  
Keyword(s):  
Rabi Frequency ◽  
Cavity Mode ◽  
Photon Number ◽  
Quantum Superposition ◽  
High Q ◽  
Cavity Coupling ◽  
Radiation Rate ◽  
Atomic Dipole ◽  
The Mean ◽  
Superposition States

AbstractHyperradiance in which radiation rate exceeds that of superradiance has been theoretically investigated in various coherently-coupled emitter-field systems. In most cases, either proposed setups were experimentally challenging or the mean photon number in a cavity was limited. In this paper, with numerical simulations and analytic calculations, we demonstrate that significant hyperradiance with a large mean photon number can occur in a microlaser system, where pairs of two-level atoms prepared in quantum superposition states traverse a high-Q cavity in the presence of a pump field intersecting the cavity mode. Hyperradiance is induced when the intracavity-pump Rabi frequency is out of phase with respect to the atom-cavity coupling so that the reduction of atomic polarization by the atom-cavity coupling is compensated by the pump Rabi frequency in the steady state to maximize atomic photoemission.

scholarly journals Observation of scalable sub-Poissonian-field lasing in a microlaser

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Byoung-moo Ann ◽  
Younghoon Song ◽  
Junki Kim ◽  
Daeho Yang ◽  
Kyungwon An
Keyword(s):  
Variance Reduction ◽  
Cavity Mode ◽  
Photon Number ◽  
Quantum Limit ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Fock State ◽  
Cavity Coupling ◽  
Poisson Fields ◽  
Poisson Field

AbstractSub-Poisson field with much reduced fluctuations in a cavity can boost quantum precision measurements via cavity-enhanced light-matter interactions. Strong coupling between an atom and a cavity mode has been utilized to generate highly sub-Poisson fields. However, a macroscopic number of optical intracavity photons with more than 3 dB variance reduction has not been possible. Here, we report sub-Poisson field lasing in a microlaser operating with hundreds of atoms with well-regulated atom-cavity coupling and interaction time. Its photon-number variance was 4 dB below the standard quantum limit while the intracavity mean photon number scalable up to 600. The highly sub-Poisson photon statistics were not deteriorated by simultaneous interaction of a large number of atoms. Our finding suggests an effective pathway to widely scalable near-Fock-state lasing at the macroscopic scale.

scholarly journals Coherently Driven N Number of Degenerate Three-Level Atoms with Parametric Amplifier

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Tamirat Abebe ◽  
Chimdessa Gashu ◽  
Nebiyu Gemechu
Keyword(s):  
Characteristic Function ◽  
Cavity Mode ◽  
Photon Number ◽  
Parametric Amplifier ◽  
Frequency Interval ◽  
Normal Order ◽  
Quantum Langevin Equation ◽  
Quadrature Squeezing ◽  
Level Laser ◽  
The Mean

We have analyzed the squeezing and statistical properties of the cavity light beam produced by a coherently driven degenerate three-level laser with a degenerate parametric amplifier (DPA) in an open cavity and coupled to a vacuum reservoir via a single-port mirror. We have carried out our analysis by putting the noise operators associated with the vacuum reservoir in normal order. Applying the solutions of the equations of evolution for the expectation values of the atomic operators and the quantum Langevin equation for the cavity mode operator, the mean photon number and the quadrature squeezing of the cavity light are calculated. And a large part of the mean photon number is confined in a relatively small frequency interval. Furthermore, we also obtain the antinormally ordered characteristic function defined in the Heisenberg picture. With the aid of the resulting characteristic function, we determine the Q function which is then used to calculate the photon number distribution.

scholarly journals Enhanced Squeezing and Entanglement in Nondegenerate Three-Level Laser Coupled to Squeezed Vacuum Reservoir

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ebisa Mosisa
Keyword(s):  
Differential Equations ◽  
Cavity Mode ◽  
Photon Number ◽  
Intensity Difference ◽  
Normal Ordering ◽  
Symplectic Matrix ◽  
Squeezed Vacuum ◽  
Level Atom ◽  
Level Laser ◽  
The Mean

Squeezing and entanglement of a two-mode cascade laser, produced by a three-level atom which is initially prepared by a coherent superposition of the top and bottom levels then injected into a cavity coupled to a two-mode squeezed vacuum reservoir is discussed. I obtain stochastic differential equations associated with the normal ordering using the pertinent master equation. Making use of the solutions of the resulting differential equations, we determined the mean photon number for the cavity mode and their correlation, EPR variables, smallest eigenvalue of the symplectic matrix, intensity difference fluctuation, and photon number correlation. It is found that the squeezed vacuum reservoir increases the degree of the statistical and nonclassical features of light produced by the system. Furthermore, using the criteria developed by logarithm negativity and Hillery-Zubairy criteria, the quantum entanglement of the cavity mode is quantified. It is found that the degree of the entanglement for the system under consideration increases with the squeezing parameter of the squeezed vacuum reservoir.

scholarly journals Regime of small number of photons in the cavity for a singleemitter laser

2021 ◽  
Vol 2103 (1) ◽  
pp. 012158
Author(s):  
N V Larionov
Keyword(s):  
Differential Equation ◽  
Exact Solutions ◽  
Master Equation ◽  
Cavity Mode ◽  
Photon Number ◽  
System Of Equations ◽  
Equation Approach ◽  
Master Equation Approach ◽  
Single Emitter ◽  
Analytical Expressions

Abstract The model of a single-emitter laser generating in the regime of small number of photons in the cavity mode is theoretically investigated. Based on a system of equations for different moments of the field operators the analytical expressions for mean photon number and photon number variance are obtained. Using the master equation approach the differential equation for the phase-averaged quasi-probability Q is derived. For some limiting cases the exact solutions of this equation are found.

The influence of the classical homogenous gravitational field on interaction of a three-level atom with a single mode cavity field

2015 ◽  
Vol 29 (29) ◽  
pp. 1550175 ◽  
Author(s):  
N. H. Abd El-Wahab ◽  
Ahmed Salah
Keyword(s):  
Electromagnetic Field ◽  
Gravitational Field ◽  
Photon Number ◽  
Single Mode ◽  
Temporal Behavior ◽  
Cavity Field ◽  
Text Type ◽  
Level Atom ◽  
The Mean ◽  
Single Mode Cavity

We study the interaction between a single mode electromagnetic field and a three-level [Formula: see text]-type atom in the presence of a classical homogenous gravitational field when the atom is prepared initially in the momentum eigenstate. The model includes the detuning parameters and the classical homogenous gravitational field. The wave function is calculated by using the Schrödinger equation for a coherent electromagnetic field and an atom is in its excited state. The influence of the detuning parameter and the classical homogenous gravitational field on the temporal behavior of the mean photon number, the normalized second-order correlation function and the normal squeezing is analyzed. The results show that the presence of these parameters has an important effect on these phenomena. The conclusion is reached and some features are given.

scholarly journals Creation of macroscopic quantum superposition states by a measurement

2008 ◽  
Vol 83 (6) ◽  
pp. 60004 ◽  
Author(s):  
I. E. Mazets ◽  
G. Kurizki ◽  
M. K. Oberthaler ◽  
J. Schmiedmayer
Keyword(s):  
Quantum Superposition ◽  
Macroscopic Quantum ◽  
Superposition States

scholarly journals Optical cavity mode dynamics and coherent phonon generation in high- Q micropillar resonators

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
S. Anguiano ◽  
A. E. Bruchhausen ◽  
I. Favero ◽  
I. Sagnes ◽  
A. Lemaître ◽  
...  
Keyword(s):  
Cavity Mode ◽  
Optical Cavity ◽  
Coherent Phonon ◽  
High Q ◽  
Phonon Generation
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